The whole idea is that the ejector rod is held at both ends. If the locking bolt (which is what S&W calls that little pin) is coming back all the way, there is something wrong. With the cylinder open, it should stick out at the front just a little, maybe .004" or so. If it sticks out much more than that, it might be stuck. Try tapping it with a plastic mallet (screwdriver handle will do) and see what happens.
Did you buy the gun new? It is possible that someone replaced that locking bolt with one intended for a short barrel gun, but that is a bit far-fetched.
Jim
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